72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
package prompt
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"gitea.maximumdirect.net/eric/scriptorium/internal/domain"
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"text/template"
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)
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var (
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ErrMissingRequiredInput = errors.New("missing required input artifact")
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ErrUnknownInput = errors.New("referenced unknown input artifact")
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ErrInvalidTemplate = errors.New("invalid prompt template")
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ErrInvalidMessageRole = errors.New("invalid or empty message role")
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)
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type goRenderer struct{}
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func NewGoRenderer() Renderer {
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return &goRenderer{}
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}
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func (r *goRenderer) Render(ctx context.Context, profile *domain.PromptProfile, inputs map[string]*domain.Artifact, vars map[string]string) (*domain.RenderedPrompt, error) {
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// 1. Verify required inputs
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for _, req := range profile.ExpectedInputs {
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if _, ok := inputs[req]; !ok {
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return nil, fmt.Errorf("%w: %s", ErrMissingRequiredInput, req)
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}
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}
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// 2. Setup template functions
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funcs := template.FuncMap{
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"input": func(name string) (string, error) {
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art, ok := inputs[name]
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if !ok {
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return "", fmt.Errorf("%w: %s", ErrUnknownInput, name)
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}
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return string(art.Body), nil
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},
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}
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var renderedMessages []domain.RenderedMessage
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for i, tmplMsg := range profile.Templates {
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if tmplMsg.Role == "" {
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return nil, fmt.Errorf("%w: message %d", ErrInvalidMessageRole, i)
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}
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// Parse and execute template
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tmpl, err := template.New(fmt.Sprintf("msg_%d", i)).Funcs(funcs).Parse(tmplMsg.Content)
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if err != nil {
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return nil, fmt.Errorf("%w: message %d: %v", ErrInvalidTemplate, i, err)
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}
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var buf bytes.Buffer
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if err := tmpl.Execute(&buf, vars); err != nil {
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return nil, fmt.Errorf("execution failed for message %d: %v", i, err)
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}
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renderedMessages = append(renderedMessages, domain.RenderedMessage{
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Role: tmplMsg.Role,
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Content: buf.String(),
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})
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}
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return &domain.RenderedPrompt{
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Messages: renderedMessages,
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}, nil
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}
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